Linear and crosslinked Polyurethanes based catalysts for reduction of methylene blue

Sultan, Misbah; Javeed, Asma; Uroos, Maliha; Imran, Muhammad; Jubeen, Farhat; Nouren, Shazia; Saleem, Nazish; Bibi, Ismat; Masood, Rashid; Ahmed, Waqas

doi:10.1016/j.jhazmat.2017.10.019

Cited by 30 publications

(24 citation statements)

References 32 publications

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“…This spectrum was recorded to make a structural Figure 1 has repudiated any chemical change in the structure of CPUF even after its application in reduction process. Hence, it can be concluded that CPUF has provided a reaction site and just acted as a catalyst in the observed reduction process [5]. Apparently, synthesized CPUF was cellular in nature.…”

Section: Resultsmentioning

confidence: 86%

“…Polyurethane Foam (CPUF). The synthesis of CPUF was performed following the previous reported method [5]. The mole ratio of monomers was 2 : 1 : 1 for TDI, PCL, and TEPA, respectively.…”

Section: Synthesis and Characterization Of Cross-linkedmentioning

confidence: 99%

“…Mostly, inorganic catalysts are used which poses issues of secondary pollution or regeneration after treatment. To overcome these obstacles, polymeric catalysts such as polyurethanes have been proposed [5].…”

Section: Introductionmentioning

confidence: 99%

“…Mostly, such treatments are reported with adsorption mechanisms due to polarity containing active sites in the structure of polyurethane. However, catalytic role of polyurethane during reduction treatments has been investigated as well [5].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, we studied reduction of methylene blue (MB) dye with linear and cross-linked polyurethane catalysts in the presence of sodium borohydride (NaBH 4 ) as a reducing agent [5]. But, NaBH 4 is a known hazardous substance which can penetrate through the skin and eye and inhalation.…”

Section: Introductionmentioning

confidence: 99%

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Ecofriendly Reduction of Methylene Blue with Polyurethane Catalyst

Sultan

Waheed

Bibi

et al. 2019

International Journal of Polymer Science

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A number of physical, chemical, and biological technologies have been developed to address the issue of synthetic dyes in wastewater. One of the important chemical methods involves reduction of these stringent pollutants into less hazardous products. In this study, a cross-linked polyurethane foam (CPUF) was prepared from toluene diisocyanate (TDI), tetraethylenepentamine (TEPA), and polycaprolactone diol (PCL; Mw: 1000 g/mole). To avoid harmful reducing agents, ecofriendly reduction of methylene blue (MB) was executed with CPUF as catalyst where ascorbic acid and fresh juice extracts were applied as reducing agents. The FTIR and SEM analysis confirmed the chemical composition and porous morphology of CPUF, respectively. The 100% reduction of MB was recorded in just 15 minutes with ascorbic acid and CPUF, while similar result was obtained in 37 minutes in blank experiment composed of only MB and ascorbic acid. Thus, catalytic role of CPUF in reduction process was proved. Fresh fruit extracts also participated in the reduction process, but rate of reaction was accelerated in the presence of CPUF. The reusability study of the catalyst supported its stability and efficiency. All the successful reduction processes followed 1st-order kinetics with highest apparent rate constant for ascorbic acid. Furthermore, phytotoxicity evaluation proved safe reduction of MB with 60% germination index. Hence, it can be concluded that catalytic role of CPUF has been established with safe and biodegradable reducing agents which can be extended to other redox processes.

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Section: Resultsmentioning

confidence: 86%

“…Polyurethane Foam (CPUF). The synthesis of CPUF was performed following the previous reported method [5]. The mole ratio of monomers was 2 : 1 : 1 for TDI, PCL, and TEPA, respectively.…”

Section: Synthesis and Characterization Of Cross-linkedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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